Display panel

ABSTRACT

A display panel includes an active area and a peripheral area surrounding the active area, and includes first and second substrates, a shading layer and an adhesive agent. The second substrate is disposed opposite the first substrate. The shading layer is disposed on the first substrate and corresponds to the peripheral area. The shading layer includes a first contact surface contacting with the first substrate, the first contact surface has a first edge. The adhesive agent is disposed between the first substrate and the second substrate and corresponds to the shading layer. The adhesive agent includes two second contact surfaces respectively facing the first substrate and the second substrate, one of the second surfaces has a second edge near the active area, and the line edge roughness of the second edge is greater than that of the first edge.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. Ser. No.15/047,487, filed Feb. 18, 2016, which claims priority under 35 U.S.C.§119(a) on Patent Application No(s). 104108822, filed in Taiwan,Republic of China on Mar. 19, 2015, the entire contents of which arehereby incorporated by reference.

BACKGROUND

Technical Field

The disclosure relates to a display panel, and in particular to adisplay panel of high reliability.

Related Art

As the progressive of technology, a flat display panel is widely appliedto various fields. Because it has advantages of compact volume, lowpower consumption, and non-radiation, it gradually replaces traditionalCRT (cathode ray tube) display device and applies to various electronicproducts, for example, mobile phone, portable multimedia device,notebook computer, LCD (liquid crystal display) TV or LCD monitor, etc.

Taking an LCD display for example, the LCD display includes a displaypanel and a backlight module. The display panel includes a thin filmtransistor (TFT) substrate, a color filter substrate and a liquidcrystal layer sandwiched between both of the substrates. Herein, duringmanufacturing the conventional display panel, for example, a sealant isapplied to the periphery of the TFT substrate, and the liquid crystalsare injected within the sealant. Then, the TFT substrate is attachedcorrespondingly to the color filter substrate in vacuum environment, andthe sealant is solidified to obtain an LCD panel. However, as to the LCDpanel, sometimes liquid crystal molecules may leak or external moisturemay enter the display panel due to insufficient adhesion between thesealant and the substrates. As a result, the product reliability fallsdown.

Therefore, it is an important subject to provide a display panel inwhich the adhesion strength between the adhesive agent and thesubstrates is enhanced for improving product reliability.

SUMMARY

One objective of the disclosure is to provide a display panel in whichthe adhesion strength between the adhesive agent and the substrates isenhanced and the product reliability is improved.

A display panel according to the disclosure includes an active area anda peripheral area surrounding the active area. It comprises a firstsubstrate, a second substrate, a shading layer and an adhesive agent.The second substrate is disposed opposite the first substrate. Theshading layer is disposed on the first substrate and located in theperipheral area. The shading layer includes a first contact surfacecontacting with the first substrate, and the first contact surface has afirst edge. The adhesive agent is disposed between the first substrateand the second substrate, and corresponds to the shading layer. Theadhesive agent includes two second contact surfaces respectively facingthe first substrate and the second substrate, one of the second surfaceshas a second edge near the active area, and the line edge roughness ofthe second edge is greater than that of the first edge.

In one embodiment, the display panel further includes a color filtersubstrate, and the color filter substrate includes the first substrateand the shading layer.

In one embodiment, the shading layer further includes a first side wall,the adhesive agent further comprises a second side wall near the firstside wall of the shading layer, and the surface roughness of the secondside wall is greater than that of the first side wall.

In one embodiment, the second side wall of the adhesive agent is nearthe active area, the adhesive agent further includes a plurality ofbubbles, and the bubbles are close to the second side wall.

In one embodiment, one of the second contact surfaces further includesan embossed pattern, and the embossed pattern is like a lattice.

In one embodiment, the adhesive agent includes a plurality of bubblesdistributed near the active area.

In one embodiment, the adhesive agent further includes a side wall nearthe active area, and the bubbles are close to the side wall.

In one embodiment, the shading layer further includes a groove, and thegroove corresponds to the adhesive agent.

In one embodiment, the adhesive agent is formed as a rectangularenclosure between the first substrate and the second substrate, theadhesive agent includes at least one straight portion and at least onecorner portion, and the maximum width of the corner portion is greaterthan that of the straight portion.

In one embodiment, the first substrate further has a third edge awayfrom the active area, and the first edge of the shading layer is locatedbetween the second edge of the adhesive agent and the third edge of thefirst substrate.

In one embodiment, the display panel further includes a display mediumlayer, the adhesive agent encloses the first substrate and the secondsubstrate to define a space, and the display medium layer is disposed inthe space.

In summary, as to the display panel according to the disclosure, theshading layer includes a first contact surface contacting with the firstsubstrate, and the first contact surface has a first edge. In addition,the adhesive agent corresponds to the shading layer, and the adhesiveagent includes two second contact surfaces respectively facing the firstsubstrate and the second substrate. One of the second surfaces has asecond edge near the active area, and the line edge roughness of thesecond edge is greater than that of the first edge. Because the lineedge roughness of the second edge of the adhesive agent is greater,relatively the contact length between the adhesive agent and thesubstrates is also longer. Therefore, the adhesive capability betweenthe adhesive agent and the substrates is enhanced, and the displaymedium will as little as possible leak. Besides, the external moisturewill also as little as possible enter the display panel, so the productreliability of the display panel is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will become more fully understood from the detaileddescription and accompanying drawings, which are given for illustrationonly, and thus are not limitative of the present disclosure, andwherein:

FIG. 1 is a schematic top view showing a display panel according to theembodiment of the disclosure;

FIG. 2 is a sectional schematic diagram along line A-A in FIG. 1;

FIG. 3 is an enlarged schematic diagram showing the zone A in thedisplay panel in FIG. 1;

FIG. 4 is a sectional schematic diagram showing the display panelaccording to another example of the disclosure; and

FIG. 5 is a schematic diagram showing a display device according to theembodiment of the disclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

The embodiments of the disclosure will be apparent from the followingdetailed description, which proceeds with reference to the accompanyingdrawings, wherein the same references relate to the same elements.

Referring to FIG. 1 to FIG. 3, FIG. 1 is a schematic top view showing adisplay panel 1 according to the embodiment of the disclosure. FIG. 2 isa sectional schematic diagram along line A-A in FIG. 1, and FIG. 3 is anenlarged schematic diagram showing the zone A in the display panel 1 inFIG. 1.

Referring to FIG. 1, the display panel 1 includes an active area AA anda peripheral area BB surrounding the active area AA. Herein, whenoverlooking the display panel 1, it is clear that the active area AArepresents the region of the display panel 1 which the light beam canpass through to display an image screen. Furthermore, the peripheralarea BB represents the region which surrounds the active area AA and thelight beam can not pass through.

Referring to FIG. 2, the display panel 1 includes a first substrate 11,a second substrate 12 and a display medium layer 15. In addition, thedisplay panel 1 further includes a shading layer 13 and an adhesiveagent 14.

The first substrate 11 and the second substrate 12 are disposed oppositeeach other. The display medium layer 15 is sandwiched between the firstsubstrate 11 and the second substrate 12. The display panel 1 may be aLCD (liquid crystal display) panel or an OLED (organic light-emittingdiode) display panel. Herein, the display panel 1 is the LCD panel forexample, so the display medium layer 15 is a liquid crystal layer.Alternatively, if the display panel 1 is an OLED display panel, thedisplay medium layer 15 may be a cover plate to protect the organiclight-emitting layer from external moisture or particle pollution.

The first substrate 11 or the second substrate 12 may be formed bytransparent material. For example, the material may be glass, quartz orthe like, plastic, rubber, fiberglass, or other polymer materials.Alternatively, the first substrate 11 or the second substrate 12 may beformed by non-transparent material. For example, the material may becomposite plate of metal-fiberglass, composite plate of metal-ceramics,printed circuit board, or other material. In the embodiment, thematerial of both of the first substrate 11 and the second substrate 12are transparent glass for example.

The shading layer 13 is disposed on the first substrate 11 and locatedin the peripheral area BB. In the embodiment, when overlooking thedisplay panel 1 above the first substrate 11, it is seen that theshading layer 13 at least covers most of the peripheral area BB (FIG. 1does not shows the shading layer 13, FIG. 3 shows the edge of eachelement and relative position of active area AA but does not show thesecond substrate 12). The shading layer 13 may be a black matrix, and itis formed by non-transparent material, for example, metal or resin. Themetal for example may be chrome, chromium or nitrogen oxide chromiumcompounds. Because the shading layer 13 is non-transparent material, itcan define a non-transparent region (namely peripheral area BB) on thefirst substrate 11, and thus a transparent region (namely active areaAA) is also defined.

Besides, the display panel 1 in the embodiment further includes a filterlayer 16. The filter layer 16 is disposed on the first substrate 11 andcorresponds to the active area AA. For example, the filter layer 16 mayinclude a red filter, a green filter and a blue filter. Their materialmay be transparent material, for example, pigment or dye. In theembodiment, the shading layer 13 and the filter layer 16 are included ina color filter array and disposed on the first substrate 11, so that thefirst substrate 11 having the color filter array becomes a color filtersubstrate. In addition, a TFT (thin film transistor) array (not shown inthe figure) is disposed on the second substrate 12, so that the secondsubstrate 12 having the TFT array becomes a TFT substrate. However, inother embodiments, the shading layer 13 and the filter layer 16 may berespectively disposed on the second substrate 12, so it becomes a BOA(black matrix on array) substrate or a COA (color filter on array)substrate, and it is not limited thereto.

The adhesive agent 14 is disposed between the first substrate 11 and thesecond substrate 12, and it encloses the first substrate 11 and thesecond substrate 12. Herein, the adhesive agent 14 corresponds to theshading layer 13, and the adhesive agent 14 is between the secondsubstrate 12 and the shading layer 13. Thus, when overlooking thedisplay panel 1 in the embodiment, it is found that the adhesive agent14 is covered by the shading layer 13. The adhesive agent 14 may be heatcuring adhesive, light curing adhesive or their combination. In theembodiment, the adhesive agent 14 is light curing adhesive (for exampleUV curing adhesive) and it is applied to and surrounds the firstsubstrate 11 and the second substrate 12 for example but not limited to.In addition, the adhesive agent 14, the first substrate 11 and thesecond substrate 12 may define a space (not labeled in figure), and thedisplay medium layer 15 can be disposed in the space. Herein, forexample but not limited to, ODF (one drop filling) is utilized to fillthe space enclosed by the adhesive agent 14 with the liquid crystalmolecules.

Besides, at least one spacer 17 is disposed between the first substrate11 and the second substrate 12, and it is correspondingly located withinthe peripheral area BB (not shown in FIG. 1 and FIG. 3). Herein, thematerial of the space 17 may be resin, silicate salts, fiberglass,photosensitive resist material, etc. and it is not limited to. Thespacer 17 is utilized to keep the interval between the first substrate11 and the second substrate 12, so the space is filled with the liquidcrystal molecules. In addition, the display panel 1 may further includesa plurality of scan lines and a plurality of data lines (no shown in thefigure). The scan lines and the data lines are interlaced to define aplurality of pixels. Therefore, when the scan lines of the display panel1 receive a scan signal, the TFTs corresponding to the respective scanlines accordingly turn on and data signals corresponding to the pixelsof respective columns are transmitted to the corresponding pixels by thedata lines. Thus, the display panel 1 can display an image screen.

Referring to FIG. 2 and FIG. 3 again, the shading layer 13 located inthe peripheral area BB includes a first contact surface 131 contactingwith the first substrate 11, and the first contact surface 131 has afirst edge L1 away from the active area AA. In addition, the adhesiveagent 14 includes two second contact surfaces 141, 142 respectivelyfacing the first substrate 11 and the second substrate 12, and one ofthe second surfaces 141, 142 has a second edge L2 near the active areaAA. Herein, the second edge L2 is a line edge of the second contactsurface 141 of the adhesive agent 14 which contacts with the shadinglayer 13. The second edge L2 is not a smooth straight line, so the lineedge roughness of the second edge L2 of the second contact surface 141is greater than that of the first edge L1 of the first contact surface131. Herein, the greater line edge roughness means that the edge of theline is not smooth so it is a bent line. Preferably, the line edgeroughness of the second edge L2 of the second contact surface 141 facingthe first substrate 11 and the line edge roughness of the second edge(not labeled) of the second contact surface 142 facing the secondsubstrate 12 both are greater than that of the first edge L1 of thefirst contact surface 131. Because the line edge roughness of the secondedge L2 of the adhesive agent 14 is greater, relatively the contactlength between the adhesive agent 14 and the substrates is also longer.Therefore, the adhesive capability between the adhesive agent 14, thefirst substrate 11 and the second substrate 12 is enhanced, so thetightness of the display panel 1 is improved. The adhesive capability ofthe adhesive agent 14 to the two substrates is greater, and the externalmoisture will as little as possible enter the display panel 1.

In addition to the feature that the line edge roughness of the secondedge L2 is greater than that of the first edge L1, the display panel 1in the embodiment further has the following features. The firstsubstrate 11 further has a third edge L3 away from the active area AA,and the first edge L1 of the shading layer 13 is located between thesecond edge L2 and the third edge L3. However, in other embodiments, thefirst edge L1 of the shading layer 13 may align with the third edge L3.Besides, the adhesive agent 14 further has a fourth edge L4 away fromthe active area AA. Preferably, the line edge roughness of the fourthedge L4 is also greater than that of the first edge L1 of the firstcontact surface 131. Therefore, the contact length of the adhesive agent14 and the first substrate 11 (and the second substrate 12) is extendedto enhance their adhesive capability.

Besides, referring to FIG. 2 again, the shading layer 13 furtherincludes a first side wall S1 located in the non-active area BB, theadhesive agent 14 further includes a second side wall S2 near the firstside wall of the shading layer and near the active area AA, and thesurface roughness of the second side wall S2 is greater than that of thefirst side wall S1. In other words, in FIG. 2, the line edge roughnessof the second edge L2 of the adhesive agent 14 is greater than that ofthe first edge L1 of the shading layer 13, and the surface roughness ofthe second side wall S2 is also greater than that of the first side wallS1 of the shading layer 13. In addition, in the adhesive agent 14 ofFIG. 2, another side wall (namely the outer side wall of the adhesiveagent 14) opposite the second side wall S2 also includes a roughsurface, and the surface roughness of another side wall is also greaterthan that of the first side wall S1 of the shading layer 13.

In addition, one of the second contact surfaces 141, 142 furtherincludes an embossed pattern P, and the embossed pattern P is like alattice. As shown in FIG. 3, the embossed pattern P in the embodiment islocated at the side of the second contact surface 141 which is fartheraway from the active area AA. Herein, the embossed pattern P is formedpurposely. For example, it may be formed by the adhesive agent 14pressing the fan-out of the circuit line, and it is preferably like alattice. The embossed pattern P like lattice can further enhance theadhesive capability of the adhesive agent 14 to the substrate.

Besides, the adhesive agent 14 at includes a plurality of bubbles Bdistributed near the active area AA (as shown in FIG. 3 but the bubblesB are not shown in FIG. 2). The bubbles B are close to the second sidewall S2 of the adhesive agent 14. The substance contained in the bubblesB is distinct from the adhesive agent 14. Herein, the substancecontained in the bubbles B for example may be liquid crystal molecules.The cause of the bubbles B may be: when filling the space enclosed bythe adhesive agent 14 with the liquid crystal molecules, merely part ofthe liquid crystal molecules will permeate the adhesive agent 14 to formthe bubbles B, and therefore the rough surfaces are formed on the secondedge L2 and the second side wall S2 of the adhesive agent 14.

Besides, referring to FIG. 1 again, the adhesive agent 14 is formed asan enclosure between the first substrate 11 and the second substrate 12and its shape is similar to a rectangle (namely rectangular space). Theadhesive agent includes at least one straight portion 143 and at leastone corner portion 144. Herein, there are four straight portions 143 andfour corner portions 144, and the maximum width d1 of the corner portion144 is greater than the maximum width d2 of the straight portion 143(d1>d2). Because the maximum width d1 of the corner portion 144 isgreater than the maximum width d2 of the straight portion 143, thecorner portion 144 has larger area on condition of the same length.Therefore, it increases the contact area between the corner portions 144and the two substrates to enhance the adhesive capability at the cornerportions 144.

Referring to FIG. 4, it is a sectional schematic diagram showing thedisplay panel 1 a according to another example of the disclosure.

The difference from the display panel 1 in FIG. 2 is that the shadinglayer 13 of the display panel 1 a further includes a groove U whichcorresponds to the adhesive agent 14. Herein, there are two grooves Ufor example. Preferably, the grooves U correspond to the peripheral areaBB and surround the active area AA, and the grooves U are filled withthe adhesive agent 14. In other words, the grooves U on the shadinglayer 13 of the display panel 1 a may be arranged in a circlecorresponding to the adhesive agent 14. Therefore, it blocks the activearea AA from the moisture from the outer of the shading layer 13, andenhances the adhesion strength of the adhesive agent 14 and the shadinglayer 13. In addition, during assembling the first substrate 11 and thesecond substrate 12, the groove U can prevent the adhesive agent 14 frommoving toward the outside of the substrate.

Because the technique features of other elements of the display panel 1a can refer to those of the display device 1, they are not repeated hereagain.

In addition, referring to FIG. 5, it is a schematic diagram showing adisplay device 2 according to the embodiment of the disclosure.

The display device 2 includes a display panel 3 and a backlight module4. The display panel 3 and the backlight module 4 are disposed oppositeeach other. The display device in the embodiment is an LCD device, andthe display panel 3 employs one of the above mentioned display panel 1,1 a, or other various implementation. Because specific techniquecontents can refer to the above embodiments, they are not repeated hereagain. When the light beam E emitted from the backlight module 4 passesthrough the display panel 3, it displays colors to form an image by eachpixel of the display panel 3.

In summary, as to the display panel according to the disclosure, theshading layer includes a first contact surface contacting with the firstsubstrate, and the first contact surface has a first edge. In addition,the adhesive agent corresponds to the shading layer, and the adhesiveagent includes two second contact surfaces respectively facing the firstsubstrate and the second substrate. One of the second surfaces has asecond edge near the active area, and the line edge roughness of thesecond edge is greater than that of the first edge. Because the lineedge roughness of the second edge of the adhesive agent is greater,relatively the contact length between the adhesive agent and thesubstrates is also longer. Therefore, the adhesive capability betweenthe adhesive agent and the substrate is enhanced, and the display mediumwill as little as possible leak. Besides, the external moisture willalso as little as possible enter the display panel, so the productreliability of the display panel is improved.

Although the disclosure has been described with reference to specificembodiments, this description is not meant to be construed in a limitingsense. Various modifications of the disclosed embodiments, as well asalternative embodiments, will be apparent to persons skilled in the art.It is, therefore, contemplated that the appended claims will cover allmodifications that fall within the true scope of the disclosure.

What is claimed is:
 1. A display panel including an active area and aperipheral area outside the active area, comprising: a first substrate;a second substrate disposed opposite the first substrate; a shadinglayer disposed on the first substrate and located in the peripheralarea, wherein the shading layer includes a first contact surfacecontacting with the first substrate, and the first contact surface has afirst edge, the first edge is away from the active area in view of anormal direction of the first contact surface; and an adhesive agentdisposed between the first substrate and the second substrate andcorresponding to the shading layer, wherein the adhesive agent includestwo second contact surfaces respectively facing the first substrate andthe second substrate, one of the second contact surfaces has a secondedge near the active area, and the second edge has a bent line in viewof the normal direction of the first contact surface, wherein, in viewof the normal direction of the first contact surface, the firstsubstrate has a third edge away from the active area, the third edge iscloser to the first edge than the second edge.
 2. The display panel ofclaim 1, wherein the first substrate comprises a color filter array, andthe color filter array comprises the shading layer and a filter layer.3. The display panel of claim 1, wherein the shading layer furthercomprises a first side wall, the adhesive agent further comprises asecond side wall near the first side wall of the shading layer, and asurface roughness of the second side wall is greater than a surfaceroughness of the first side wall.
 4. The display panel of claim 3,wherein the adhesive agent further comprises a plurality of bubbles, andthe bubbles are close to the second side wall.
 5. The display panel ofclaim 1, wherein the shading layer further comprises a first side wall,the adhesive agent further comprises a second side wall, the second sidewall of the adhesive agent is near the active area, and a surfaceroughness of the second side wall is greater than a surface roughness ofthe first side wall.
 6. The display panel of claim 1, furthercomprising: at least a spacer located within the peripheral area anddisposed between the active area and the second edge.
 7. The displaypanel of claim 1, wherein the shading layer further comprises a groove,and the groove corresponds to the adhesive agent.
 8. The display panelof claim 1, wherein the adhesive agent is formed as a rectangularenclosure between the first substrate and the second substrate, theadhesive agent includes at least one straight portion and at least onecorner portion, and the maximum width of the corner portion is greaterthan that of the straight portion.
 9. The display panel of claim 1,further comprising: a display medium layer, disposed in a space definedby the adhesive agent, the first substrate and the second substrate. 10.A display panel including an active area and a peripheral area outsidethe active area, comprising: a first substrate; a second substratedisposed opposite the first substrate; a shading layer disposed on thefirst substrate and located in the peripheral area, wherein the shadinglayer includes a first contact surface contacting with the firstsubstrate; and an adhesive agent disposed between the first substrateand the second substrate and corresponding to the shading layer, whereinthe adhesive agent includes two second contact surfaces respectivelyfacing the first substrate and the second substrate, one of the secondcontact surfaces has an edge near the active area, and the edge has abent line in view of a normal direction of the first contact surface,wherein one of the second contact surfaces further comprises an embossedpattern, and the embossed pattern is like a lattice.
 11. The displaypanel of claim 10, wherein the shading layer further comprises a groove,and the groove corresponds to the adhesive agent.
 12. The display panelof claim 10, wherein the adhesive agent is formed as a rectangularenclosure between the first substrate and the second substrate, theadhesive agent includes at least one straight portion and at least onecorner portion, and the maximum width of the corner portion is greaterthan that of the straight portion.
 13. The display panel of claim 10,further comprising: a display medium layer, disposed in a space definedby the adhesive agent, the first substrate and the second substrate. 14.A display panel including an active area and a peripheral area outsidethe active area, comprising: a first substrate; a second substratedisposed opposite the first substrate; a shading layer disposed on thefirst substrate and located in the peripheral area, wherein the shadinglayer includes a first contact surface contacting with the firstsubstrate; and an adhesive agent disposed between the first substrateand the second substrate and corresponding to the shading layer, whereinthe adhesive agent includes two second contact surfaces respectivelyfacing the first substrate and the second substrate, one of the secondcontact surfaces has an edge near the active area, and the edge has abent line in view of a normal direction of the first contact surface,wherein the adhesive agent includes a plurality of bubbles distributednear the active area.
 15. The display panel of claim 14, wherein thesubstance contained in the bubbles is distinct from the adhesive agent.16. The display panel of claim 14, wherein the substance contained inthe bubbles is liquid crystal.
 17. The display panel of claim 14,wherein the shading layer further comprises a groove, and the groovecorresponds to the adhesive agent.
 18. The display panel of claim 14,wherein the adhesive agent is formed as a rectangular enclosure betweenthe first substrate and the second substrate, the adhesive agentincludes at least one straight portion and at least one corner portion,and the maximum width of the corner portion is greater than that of thestraight portion.
 19. The display panel of claim 14, further comprising:a display medium layer, disposed in a space defined by the adhesiveagent, the first substrate and the second substrate.